Just finished my first 300 Blackout build and mounted a Vortex Crossfire 2x7 on it. I was hoping someone could help me with a question I need answered before this weekend. If I only have the opportunity to sight my AR at 25 yards, how high above the POI do I have to sight the crosshairs on a paper target for it to be within less than inch between POA and POI at 100 yards? Any info anyone can provide would be greatly appreciated. :)

Well, since you did not give us a HINT about what BULLET you are shooting, would suggest you start about 1 inch BELOW the aim point. The bullet is still rising to the line of sight on most AR type firearms. And I have seen 300 Blackout run from 120 to 240 gr bullets at different speeds.

nitestalker

02-18-2014 02:39 PM

Bullets rises when fired from a rifle? maybe? Bullets are rising down range? Not likely. Did Old Newton get his theory wrong? Or is this a long held shooting "Myth"?:)

Nitestalker- bullets begin to drop the instant they leave the barrel- IF the bore is level.

However, as that article explains- almost every rifle will be tipped up to some degree. The bullets travel in an arc (a parabola) that passes upward thru the line of sight, and drops BACK to the line of sight at the target.